Change-speed gear



s. B. Mom.

CHANGE SPEED GEAR.

APPLICATION FILED APR. Z6, 1920. Lm, MGM-ed July 6 wm 3 SHEETS--SHEET l.

S. B. MOORE.

CHANGE SPEED GEAR.

APPLICATION FILED APR.26,1920.

3 SHEETS-SHEET 2.

S. B. MOORE.

CHANGE SPEED GEAR.

APPLxc/.TION man APR. 2s. 1920.

3 SHEETS-SHEET 3.

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:WINFEN BRMLEY MOGRE, OIE' HUDDERSFTELB. FWGrLAlll'B.

Application led April 26,

.To all 'whom it may concern:

Be it known that I, SWINFEN BRAMLEY lll/Toorn, a subject of the King of Great Britain and Ireland, residing at 6l Trinity street, Hudderseld, in the county of Yorks, Flngland, have invented a new and useful Tmprovement in Change-Speed Gears, of which the following is a full and complete specihcation. v

This invention relates to improvements in change speed gears in which trains of spur or other gear wheels are brought into opera# tion for the purpose of obtaining the desired variation of the relative speed of the driving and driven shafts, and the objects of my improvement are first to obtain a maximum variation of speed with a minimum number of gear wheels, secondly to provide a simple method of varying the relative direction of motion of the driving and driven shafts, thirdly to facilitate the operation of changing the speeds and fourthly to provide a gear box in which the weight and size is in inverse ratio to the number of changes provided.

T attain these objects by the construction shown in the accompanying drawing in which:

Figures 1, Q, 3 and 4 are diagrams showing how the different speeds are obtained Fig. l showing the first or lowest speed.

Fig. 2 the second speed, Fig. 3 the third speed, and Fig. l the fourth and top speed (Tneach of these views only those parts of the mechanism actually transmitting the drive are section lined.)

Fig. 5 is a view in longitudinal section showing a complete gear, and

Fig. 6 is a broken view on an enlarged scale showin@F a device for locking the operating foot ever.

Throughout the Views similar parts are marked with like letters of reference.

The essential feature of this gear is the use of a double acting or compound clutch for transmitting the power to the gearing there being two concentrically arranged driving shafts C1 and B1 and one axially,l arranged driven shaftfD1. Both the driving shaft B1 and the driven shaft D1 are of tubular form and are mounted on the driving shaft C1 so as to take a bearing on said shaft, the shafts B1 and D1 being mounted in suitable bearings in the gear box Z. Cn the shaft A2 from or through which the power is derived is mounted one of the ele- Specification of Letters Patent.

Patented duly B, TBQB.

192e. serial No. :natia ments A of the double-acting clutch the other elements B and C of said clutch being carried by the driving shafts B1 and C1 respectively. The elements B and C of the clutch are coupled together so that they work in unison one coming into engagement with the element A as the other becomes disengaed from said element. Thr elements and C are operated in the usual manner by means of a foot operated lever F and fork F1 working in the usual gate guide and operating through thrust bearings T and T1 against the action of a spring S located between the element A of the clutch and the elements C and B of same.

To provide for the adjustment between the elements B and C of the clutch a thrust ring T2 is mounted onto the element B by means of a series of bolts T1. This thrust ring T2 is threaded on a thrust ring T3 lwhich is so mounted on the driving shaft B1 as to slide axially thereon but to have no independent rotary movement. By adjusting the relative positions of these two thrust rings T2 and T3-which is effected by removing the bolts T1 and turning the ring T2 on the ring T-the distance between the two elements B and C can be varied ,as desired. i

Cn the back end of the tubular shaft B1 is fixed a pinion B2 and on the inner shaft C1 between the inner ends of the two tubular shafts B1 and D1 is fixed a pinion C2. Cn the shaft B1 is mountedso as to rotate therewith and slide axially in relation thereto-a pinion D2 which carries dogs D2 adapted to engagesimilar dogs C2 carried by the pinion C2.

Cn a counter shaft B mounted in suitable bearings in the gear box Z in parallel relation to the driving shaft C1 are fixed three pinions B1, B2, and E3, the two former which are located at the forward end of the shaft are in constant mesh with the pinions B2 and C2 respectively. The pinion B3 which is located at the back end of the shaft is adapted to mesh with the pinion D2.

Cn a second countershaft (not shown in the drawings) are mounted the pinions B and B1 for giving the reverse by engagement with the pinions D2 and B3 when the former is in its central position e. out of gear with the pinion E2. The sliding pinion B2 and the sliding pinions B and B11 are manipulated by means of lltlll a single hand lever H moving in a gate K carried by the lid Z1 of the box Z, and operating through two selector rods, in the usual manner. the construction and arrangement being such that when the lever is in its upright central position all the gears are out of action. From this position the lever has three movements a direct forward movement which gives the slow speeds, a direct rearward movement which gives the high speeds, and a combined transverse and forward movement which gives the reverse. For the sake of distinctness the pinion D2 is shown in Fig. 1in engagement with the pinion E2 to produce the first or lowest gear although the operating hand lever H is shown in its neutral position.

When the lever H is pushed forward the pinion D2 is brought into engagement with the pinion E3 and when the clutch lever F is pushed and kept right forward the element B of the clutch engages the element A thereof. This produces the first or lowest speed the drive from the motor shaft being through the elements A and B of the clutch, the driving shaft B1 the pinions B2 and E1, the countershaft E and the pinions E3 and D2 to the driven shaft D1. To obtain the next speed the clutch lever F is merely released-the hand lever H remaining in its forward position-which allows the spring S of the clutch to come into action which takes the element B of the clutch out of engagement with the element A and brings the element C into engagement with said element A. The drive is now through the elements A and C of the clutch, the driving shaft C1, the pinions (12 and E2, the countershaft. E and the pinions E and D2. To obtain the third gear the hand lever H is moved to its rearward position and the clutch lever F is pressed and kept right forward. The former brings the pinion D2 into engagement with the pinion C2 and the latter takes the element C of the clutch out of engagement with the element A and brings the element B into engagement with said element A. the elements A and B of the clutch, the driving shaft B1, the pinions B2 and E1, the countershaft E and the inion E2 and the coupled pinions C2 and 2. To obtain the fourth or highest speed the hand lever H is left in its rearward position and the clutch lever F is released. This allows the spring of the clutch to take the element B of the clutch out of engagement with the element A and to bring the element C into engagement with said element A. The drive is now through the elements A and C of the clutch, the driving shaft C1 and the coupled pinions C2 and D2 directly to the driven shaft D1.

It will thus be seen that the hand lever is only moved when starting up, When chang- T he drive is now through ing from the second to the third speed or vice versa and when permanently stopping the drive.

To obtain the reverse the hand lever H is moved first transversely and then forward in the gate. This leaves the pinion D2 in its neutral position and brings the pinions R and R1 into mesh with the pinions D2 and E2 respectively. If the clutch lever F is now pushed and held right forward a low reverse speed suitable for traffic work will result and when the foot lever is released a higher reverse. speedsuitable for a clear road or country work-will result.

Instead of mounting the pinion D2 on the driven shaft as before described it may be loosely mounted on such shaft and remain in constant mesh with the pinion E1 on the counter shaft and a sliding dog clutch be mounted on the spliced part ofthe driven shaft D1 for the purpose of coupling either the pinion C2 or the pinion D2 to said shaft. In this construction the reverse pinion R1 would beI in constant mesh with the pinion D2 and the pinion E2 would be arranged to slide on the countershaft so as to engage the reverse pinion R.

In order to avoid the necessity of having to keep a constant pressure on the foot lever during the time the first and third speeds are employed, a locking device may be used to fix said lever in its forward position. A convenient device is that shown in Fig. G which consists of a bell-crank trip lever M pivoted to the foot lever F near the foot plate F2 thereof. One arm of this lever is shaped to enable it to be operated by the toe of the driver and the other arm-which is pressed upward by a spring such as M2-is shaped to adapt it to engage with an adjustable catch M1 mounted on the dashboard M2.

What I claim is l. A change speed gear comprising an inner driving shaft; two tubular axially arranged shafts mounted on said inner shaft one of which is the second driving shaft and the other of which is the driven shaft; a double acting clutch comprising a compound element the two parts of which arc. mounted respectively on the two driving shafts, a single element carried by the power shaft, a spring for bringing one of the parts of the compound element into engagement with the single element and for keeping the other part of the compound element out of engagement with said single element, and hand-operated means for reversing said engagements against the action of the spring a countershaft in parallel alinement with the driving and driven shafts; a pinion fixed on the tubular driving shaft and gearing with a pinion fixed on the countershaft; a pinion on the inner driving shaft gearing with a second pinion fixed on the countershaft; a third pinion fixed on lltl lili

naaaeea said countershatt; and a sliding pinion on the driven shaft adaptedeither to be put into mesh with the third pinion on the countershatt, to be brought into couple with the pinion on the inner driving shaft by means oit a clutch, or to be retained in a neutral position out ot engagement with either the third pinion on the countershatt or with the pinion on the inner driving shaft.

2. A change speed gear comprising two ooncentrically arranged shafts; a single shaft axially arranged in relation to said concentrically arranged shafts; a double acting clutch comprising two elements mounted respectively on the concentrically arranged shafts, a single element mounted on the power. shaft, a spring for bringing one of said two elements into engagement with the single element and for keeping the other of the two elements out of engagement with the single' element, and handoperated means for reversing said engagements against the action of the spring; av

countershaft in parallel alinement with the driving and driven shafts; and six gear wheels., one of which is mounted on the tubular driving shaft and engaging with a gear wheel mounted on the countershaft, another of' which is mounted on the driven shaft and adapted totake the drive :from a mating gear wheel mounted on the countershaft, and another of which is mounted on the inner driving shaft and is adapted to lbe loclred either to one of the two elements of the clutch or to the driven shaft or to driving element, and hand-operated gear for bringing the other driven element into engagement with the driving element and at the same Itime bringing the iirst named driven element out ot engagement with the driving element; a countershaft in parallel alinement with the driving and driven shafts; three spur pinions xed on said countershaft; a spur pinion fixed on the outer driving shafts and inconstant mesh with one of the pinions on the countershaft; a pinion fixed on the inner driving shaft and in constant mesh with another of the pinions on the countershatt; a spur pinion mounted on the drivenshaft and meshing with the third pinion on thecountershatt; and a sliding clutch mounted on the driven shaft and adapted to couple better said pinion or the pinion fixed on the inner driving shaft to the driven shaft.

' 4C. ln a change speed gear the combination of two concentrically arranged driving shafts; a driven shaft arranged in axial alinement with said driving shafts; a double clutch comprising one driving element and two driven elements said latter being mounted respectively on the two driving shafts, a 'spring 'for bringing one ofthe driven elements into engagement with the driving element, and hand operated gear for bringing the other driven element' into engagement with the driving element and at the same time bringing the first named driven element out of engagement with the driving element.; a countershaft in parallel alinement with the driving and driven shafts; three spur pinions fixed on said countershatt; a spur pinion fixed on one ot the driving shafts and in constantinesh with one of the pinions on the countershaft,I a pinion fixed on the other driving shaft and in constant mesh with another of the pinions on the countershait; a second counterH shaft arranged in parallel alinement with `the first countershatt; two spur pinions fined on said second countershaft; a spur pinion mounted to slide on the driven shaft and adapted to mesh with the third pinion on the first countershaft; hand-operated mechanism for bringing said sliding pinion either into mesh with the pinion on the first countershaft or into a neutral position; and hand-operated mechanism for bringing the two pinions on the second countershaft into lll) lllll mesh respectively with the sliding pinion on the driven shaft and the third the first countershaift.

@Wlltllllilltl BRAMLEY MURE.

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